<!DOCTYPE html>
<html class="reftest-wait">
  <!-- Test: if input is readonly, it is barred from constraint validation
             and should not be affected by :invalid pseudo-class. -->
  <link rel='stylesheet' type='text/css' href='style.css'>
  <body onload="document.getElementById('i').readOnly='ro'; document.documentElement.className='';">
    <input class='notinvalid' id='i' required>
  </body>
</html>
